In the news coming out about rewrites on the F4 reboot, they mention exploring deeper mythology like Kree and Skrulls

Now, I know Fox owned Super-skrull
But does anyone know about the character rights for these two races???
Kevin Feige implyed that Marvel owned them, but this seems to suggest otherwise.

And that'd be some bolshoi

Last I heard, many moons ago, was that Marvel Studios had the rights to use Skrulls, but couldn't use Klr't (Super Skrull) because, obviously, he has the powers of the Fantastic Four.

The Kree are a very gray area. The Avengers need them for Ms. Marvel and the Mar-Vell character dynasty, as well as the Kree-Skrull war and all that; but obviously, they feature prominently in the history of the FF as well. Maybe ultimately the Kree & Skrulls will wind up being that common ground that can actually extend the shared film universe into the Fox and Sony films. Who knows.